Tyler Damascus Thornton was born on April 5, 1992 in Silver Spring, Maryland, just outside Washington DC, and grew up in the basketball-rich environment of the DMV — that loose region of basketball talent that includes the District of Columbia, Maryland, and Northern Virginia and that has produced more NBA players per capita than almost any other corner of the country. Kevin Durant grew up there. Markelle Fultz grew up there. So did Quinn Cook, who would become Tyler's teammate at Duke. Thornton went to Gonzaga College High School, the Catholic Jesuit boys' school in northwest Washington that serves as the academic and athletic gateway for many of the area's top student-athletes, and he became the kind of player who defines a high school program rather than just plays for one.
By the time he was a senior at Gonzaga in 2009-10, he had become the all-time leader in career wins for the program — leading the Eagles to four consecutive 20-win seasons, a feat no Gonzaga player before him had accomplished. He averaged 14.7 points, 3.4 rebounds, 4.0 assists, and 2.1 steals per game while shooting over 80 percent from the foul line and maintaining a GPA above 3.3. He led Gonzaga to three straight Alhambra Catholic Invitational Tournament titles and held the ACIT record for most career steals. He was named the 2010 Washington DC Gatorade Boys Basketball Player of the Year and the House of Hoops Male Basketball Athlete of the Year for the entire Washington Metropolitan area. He was a first-team All-Washington Catholic Athletic Conference and All-MET selection. Off the court, he tutored at elementary schools and served meals to the homeless through Gonzaga's Campus Kitchen Project and McKenna's Wagon, and volunteered as a basketball instructor at a clinic for intellectually challenged adults. The pattern was already obvious to anyone who paid attention: this was a player who would build a basketball career on the things you couldn't see in a stat line.
He played AAU basketball for the DC Assault, the powerhouse summer program that has produced dozens of college players over the years. His AAU teammate was Josh Hairston, the Montrose Christian forward who would also commit to Duke in their class. Together they helped DC Assault win the Adidas Super 64 championship in 2007 and again in 2008, with Tyler named MVP of the 15-and-under division in 2007 and the 16-and-under division in 2008. By his senior year, the recruiting calls were coming in from Georgetown (the natural fit for a DC Catholic school point guard), NC State, Texas, Virginia, and Duke. He committed to Duke on September 13, 2008 — early enough that the recruiting industry barely had time to fully process him as a Blue Devil.
There is a piece of context that matters about why Duke recruited Tyler Thornton specifically and that the Duke Basketball Report would later write about openly: he was recruited as an insurance plan for Kyrie Irving. Kyrie was the #1 recruit in the 2010 class — a McDonald's All-American point guard from St. Patrick's in West Orange, New Jersey, the kind of player whom Coach K knew would almost certainly leave for the NBA after one season. Duke needed a guy who could competently play the point guard position behind and after Kyrie. They needed someone who would be at Duke for four years, who could run the offense steadily if asked, who could spell the starters in big moments, and who would understand his role and not complain about it. Tyler Thornton was that guy. He arrived in Durham in August 2010 carrying jersey #3 and the quiet expectation that his job was to make everyone else's basketball easier.